Merge pull request 'chore: migrate .github/workflows to .gitea/workflows' (#22) from gitea/migrate-workflows into main

chore: migrate .github/workflows to .gitea/workflows

Migrate CI workflow from GitHub Actions to Gitea Actions.
- Registry: ghcr.io → git.farh.net
- Auth: secrets.GITHUB_TOKEN → gitea.token
- Cache: type=gha → type=registry

Part of GRO-1315.

.gitea/workflows/ci.yml

@@ -62,10 +62,6 @@ jobs:
     name: Build & Push Docker Image
     runs-on: ubuntu-latest
     needs: [lint-typecheck, test]
-    permissions:
-      contents: read
-      packages: write
-      id-token: write
     steps:
       - uses: actions/checkout@v4
 
@@ -83,12 +79,12 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Log in to GitHub Container Registry
+      - name: Log in to Gitea Container Registry
         uses: docker/login-action@v3
         with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          registry: git.farh.net
+          username: ${{ gitea.actor }}
+          password: ${{ gitea.token }}
 
       - name: Build and push API image
         uses: docker/build-push-action@v6
@@ -97,7 +93,7 @@ jobs:
           file: Dockerfile
           push: true
           tags: |
-            ghcr.io/groombook/api:${{ steps.version.outputs.tag }}
-            ${{ github.ref == 'refs/heads/main' && 'ghcr.io/groombook/api:latest' || '' }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+            git.farh.net/groombook/api:${{ steps.version.outputs.tag }}
+            ${{ github.ref == 'refs/heads/main' && 'git.farh.net/groombook/api:latest' || '' }}
+          cache-from: type=registry,ref=git.farh.net/groombook/cache:api
+          cache-to: type=registry,ref=git.farh.net/groombook/cache:api,mode=max